I think this is the same or indeed very similar to a bowl I have in a purple. Mine changes colour very slightly to a smoke grey under different lighting. I don't think a conclusion was reached on mine but there may be something now. Interested to see any replies to your post. It's a gorgeous bowl I have to say. Wayne I'm sure I thought Skrdlovice for this as well, but I think that was ruled out and Zelezny Brod Sklo was a possible? I may be wrong though.m